Decoding Block Number
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Joined: Mar 2007
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From: Tennessee
Decoding Block Number
I have a "79 F100 with a 351W and I had to put a clutch in it today so I got the numbers off the block to see what year the engine is, but I don't think I got them all. This is what I could see ( 77AY-6015-AA ). Am I correct in assuming that it is a '77 engine. Thanks in advance for any replies.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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For more engine info try your specific engine forum. The 351W did not come stock in these trucks.
Engine Identification (rev):
======================
351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.
351M/400 335 series: intake is 12.7" wide the 351C is narrow.
351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.
429/460 385 series: 7 bolts in rectangular valve cover
352/360/390/427/428 FE series: Intake goes under valve covers.
-There are other indicators but these are enough to distinguish engine families.
Engine Identification (rev):
======================
351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.
351M/400 335 series: intake is 12.7" wide the 351C is narrow.
351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.
429/460 385 series: 7 bolts in rectangular valve cover
352/360/390/427/428 FE series: Intake goes under valve covers.
-There are other indicators but these are enough to distinguish engine families.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Welcome to FTE.
Well first lets get this moved to the right forum, if it's a 351W we will just move it there.
Next the first number should be a letter instead of a number, IE something like D7AE etc (which would be a 77 casting number) first letter designates decade. D=70s E=80s etc.
Well first lets get this moved to the right forum, if it's a 351W we will just move it there.
Next the first number should be a letter instead of a number, IE something like D7AE etc (which would be a 77 casting number) first letter designates decade. D=70s E=80s etc.
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
And now that you're here, take a look in the "Read First" sticky at the top of this forum. In case you didn't know, your post was moved to the Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) forum. You can easily access the main page of this forum by clicking on the blue link that contains the title of this forum, just to the leaft of the words "Welcome, LittleM" that you'll find at the top extreme right of this page.
In that sticky we have several links to info on casting numbers.
For simplicity here's the link directly to the sticky:
https://www.ford-trucks.com/forums/3...6-10-06-a.html
And as Monsterbaby said, Welcome!
In that sticky we have several links to info on casting numbers.
For simplicity here's the link directly to the sticky:
https://www.ford-trucks.com/forums/3...6-10-06-a.html
And as Monsterbaby said, Welcome!
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